Marathon Negative Split Calculator
Plan a negative split marathon strategy.
Enter your goal finish time and split ratio to get exact pace targets for each half of the race.
Negative Split Plan
Negative Split Strategy
A negative split means running the second half of a race faster than the first. Research shows this is the most common strategy among marathon world-record performances.
Split ratio: A 52/48 split means the first half takes 52% of total time, the second half 48%.
First Half Time = Total Time × Split Ratio Second Half Time = Total Time × (1 − Split Ratio)
Pace = Half Time ÷ Distance (21.0975 km per half)